Cyanide have started hosting the rules, but rather than the CRP that GW had, it's the Icepelt rulebook that Gary and myself have in hard copy, that has the full rules (including the Slann, Underworld and Pact rosters) and all the fluff.
Download it now, before GW realise they don't like it. Right click, "Save As", don't try to open it first as that doesn't seem to want to work.
http://www.bloodbowl-game.com/files/BB_LRB6.pdf